This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Identification and Resolution of Vehicle Pull and Steering Wobble Using Virtual Simulation and Testing
ISSN: 0148-7191, e-ISSN: 2688-3627
Published October 5, 2018 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
A vehicle drifts due to several reasons from its intended straight path even in the case of no steering input. Vehicle pull is a condition where the driver must apply a constant correction torque to the steering wheel to maintain a straight-line course of the vehicle. This paper presents an investigation study into the characteristics of a vehicle experiencing steering drift. The aim of the work is to study vehicle stability and the causes of vehicle drift/pull during straight line to minimize vehicle pull level and hence optimize safety measures.
A wobble in the steering wheel feels like the steering wheel is shaking to the left and right. This may get worse, if speed increases.
This paper focuses on modelling and evaluating effects of suspension parameters, differential friction, brake drag variation, Unbalanced mass in the wheel assembly and C.G. location of the vehicle under multibody dynamic simulation environment.
Asymmetry of geometry and compliance between left and right side to be causing the drift. The sensitivities of the suspension parameters are presented for each driving condition. In case of acceleration, the interaction of differential friction and driveshaft stiffness and their influence on drift are also studied. For braking condition, suspension parameters such as initial toe, camber and caster variation of front suspension are studied including the braking force difference.
The factors influencing steering pull and steering wobble include the compliance properties of the suspension and steering parameters are studied. The mechanics of the brake force interactions with these steering and suspension properties are explained here.
Simulation provides an excellent tool to examine and quantify these interactions. The SUV simulation model, MSC.ADAMS/CAR is used to show the importance of linkage compliance as a primary variable and the interactions with other steering and suspension properties. It will be shown that jounce steer and/or brake steer can be used to compensate for the unbalanced effects arising from the linkage asymmetry.
CitationAnthonysamy, B., Barde, V., Medithi, N., S, S. et al., "Identification and Resolution of Vehicle Pull and Steering Wobble Using Virtual Simulation and Testing," SAE Technical Paper 2018-01-1895, 2018, https://doi.org/10.4271/2018-01-1895.
Data Sets - Support Documents
|[Unnamed Dataset 1]|
|[Unnamed Dataset 2]|
|[Unnamed Dataset 3]|
|[Unnamed Dataset 4]|
|[Unnamed Dataset 5]|
|[Unnamed Dataset 6]|
- Orlandea, N. and Chace, M., “Simulation of a Vehicle Suspension with the ADAMS Computer Program,” SAE Technical Paper 770053, 1977, doi:10.4271/770053.
- Antoun, R., Hackert, P., and Leary, M.O., “Vehicle Dynamic Handling Computer Simulation-Model Development, Correlation and Application Using ADAMS,” SAE Technical Paper 860574, 1986, doi:10.4271/860574.
- Zhao, Q., “The Exploration of the Handling Stability,” Simulation Research Based on ADAMS 6:27-31, 2006.
- Guire, M.M. and Guenther, D., “Longitudinal Suspension Compliance Modelling with ADAMS,” SAE Technical Paper 930764, 1993, doi:10.4271/930764.
- Yin, H.B. and Shao, P.L., “Dynamic Performance Simulation of a Tracked Vehicle with ADAMS Tracked Vehicle Toolkit Software,” Systems Modelling and Simulation: Theory and Applications, 553-558, 2005.
- Feoktistov, M.N., “Simulation of Vehicle Dynamics Using the Program Package MSC.ADAMS and MSC,” NASTRAN, 2004.
- Celeri, F. and Chiesa, A., “A Method for the Evaluation of the Lateral Stability of Vehicles and Tires,” SAE Technical Paper 741101, 1974, doi:10.4271/741101.
- Pacejka, H., Tire and Vehicle DynamicsSecond Edition (2006). ISBN:980-0-7506-6918-4.
- Gillespie, T.D., Fundamentals of Vehicle Dynamics (Warrendale: Society of Automotive Engineers, Inc., 1992). ISBN:978-1-56091-199-9.